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A high-efficiency microwave approach to synthesis of Bi-modified Pt nanoparticle catalysts for ethanol electro-oxidation in alkaline medium

Paper ID Volume ID Publish Year Pages File Format Full-Text
46037 46428 2013 7 PDF Available
Title
A high-efficiency microwave approach to synthesis of Bi-modified Pt nanoparticle catalysts for ethanol electro-oxidation in alkaline medium
Abstract

The Bi-modified Pt nanoparticle catalysts using multi-walled carbon nanotubes as supports are prepared through microwave treatment and long-term standing approaches. Bi can easily modify Pt catalyst because of the strong affinity between Bi and Pt. However, only limited amount of Bi and uneven Bi-modified Pt catalyst are obtained through the long-term standing approach. The microwave approach can complete the synthesis rapidly and get uniform Bi–Pt/CNT catalysts. X-ray photoelectron spectroscopy shows that Bi (III) and Pt (0) species are the main form in the Bi–Pt/CNT catalyst. Cyclic voltammetry indicates that the modification of Bi on Pt/CNTs leads to an enhanced activity up to 260% compared to Pt/CNTs for ethanol electro-oxidation. The current of Bi–Pt/CNTs (0.1:1) is 44.8 times higher than that of Pt/CNTs at −0.3 V for 1800 s. Linear current sweep results reveal that the electro-oxidation of residual intermediate species can be effectively promoted because the adsorption of OHad species is enhanced by the addition of Bi to Pt/CNTs, which is characterized by the higher open circuit potential.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The microwave way can accelerate the Bi3+ diffusion in the solution. ► Abundant OHad species were formed on the Bi-containing catalyst. ► Current of EOR on Bi–Pt/CNTs (0.1:1) was 2.6 times higher than that on Pt/CNTs. ► Anti-poisoning ability of this novel catalyst was greatly improved. ► The Bi deposition mechanism on Pt/CNT catalysts was studied in its synthesis.

Keywords
Alkaline fuel cell; Bi modification; Ethanol oxidation; Microwave synthesis; Pt catalyst
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A high-efficiency microwave approach to synthesis of Bi-modified Pt nanoparticle catalysts for ethanol electro-oxidation in alkaline medium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 129, 17 January 2013, Pages 549–555
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us